Improvement in shuttles for sewing-machines



I. BEAVER-8'. J. M. TALLMAN.

Shuttle for Sewing-Machines. N 1 4 417 Patentedlunelmlsis.

THE GRAPHIC C0.PHOTO-L TH.39 $41 PARK PLAGEJLY.

UNITED STATES PATENT OFFICE.

JOHN BEAVER AND JEDEDIAH M. TALLMAN, OF ILION, NEW YORK.

IMPROVEMENT lN SHUTTLES FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 164,4 1?, dated J one15, 1875; application filed April 17, 1875.

' To all whom it may concern:

Be it known that we, JOHN BEAVER and JEDEDIAH M. TALLMAN, of Ilion,county of Herkimer and State of New York, have invented a new and usefulImprovement in Shuttles for Sewing-Machines; and we do hereby declarethat the following is a full, clear, and exact description thereof,reference being had to the accompanying drawings making part of thisspecification, in which Figure l is a vertical section of the improvedshuttle in the line 00 w of Fig. 2, and looking in the direction of thearrow 1 of said figure. In this view the bobbin is in its place. Fig. 2is a horizontal section of the shuttle in the line 3 yof Fig. 1. Thebobbin is removed in this view, and the spring which produces thetension and holds the bobbin in place is shown in two positions, one byfull black lines and the other by dotted lines. Fig.3 is a perspectiveview of the bobbin-holding and tension spring.

The nature of our invention consists, first, in the shuttle'case, withits bobbin-chamber extended at its front end beyond the bobbinhead, soas to form a shallow recess for the curved part of the combined latchand tension spring to enter, and thus be out of contact with thebobbin-head. This construction allows the bobbin to be made of thedesired length without coming in contact with the spring during itsrevolutions, and prevents the bobbin-spindle being cramped by beingborne against by the spring. It consists, second, in the tension-spring,which has its loose curved end extended laterally in a V or how shapedirectly across the center of the bobbin-spindle, and then terminated inan extended end, which is parallel with the axis of the shuttle-case andfitted over or against the adjusting-screw. This construction preventsthe bobbin-spool from getting out of its hearing or center, and enablesone spring to answer the twofold purpose of producing tension andholding the bobbin in a true position. It consists, third, in atensionspring constructed with the usual passages for fine thread, andwith a depression or channel in its bearing side leading from one ofsaid passages to the upper edge of the spring. By this construction theone tension-spring answers for very fine and very coarse threads, thechannel or depression admitting coarse thread between itself and theside of the shuttle-case without requiring the spring to be forcedagainst the bobbin-head or washer, although the bobbin-heads are made nosmaller than those of shuttles which are adapted for only using veryfine or medium threads. It consists, fourth, in an adjusting-screwhaving a neck and collar on its inner end, in combination with thespring and shuttle case, whereby the spring can be both forced away anddrawn up to the shuttle-case, as occasion requires.

To enable others skilled in the art to make and use my invention, I willproceed to describe it.

A is the shuttle-case. This has a full round bearing, a, and a half-round bearing, b, for the spindle B of the bobbin (3 to fit and turnin; and above the upper plane of the bearing 1) the chamber of thebobbin-case is extended so as to form a shallow recess, 0, and ashoulder, (1 as shown. D is the tension-spring, and E theadjusting-screw. The spring D is pivoted to the shuttle-case on theinside, as indicated at e, and bears snugly against said case when inaction. This spring, near the terminus of its loose end, is bent in formof a quadrant, and is just as broad as the depth of the recess 0, andsaid bent portion. enters the recess, and is thereby isolated from thehead of the bobbin. The shoulder d prevents the spring being pressedinward far enough to cramp the bobbin-spindle, when the shuttle is inuse. Just at the end of the curved part of the spring a V-shaped form isgiven to the spring, as indicated at f,- and this V-part extends acrossthe spindle of the bobbin, and holds it securely in the half-roundbearing 1). From the V-shaped part of the spring there is a straightextended part, 9, which has a notch, h, cut in its upper edge. Thisstraight part extends over the adj listing-screw E, and receives withinits notch h the neck of said screw, as shown. The adjusting-screw isfitted in the upper side of the point of the shuttlecase, and can beadjusted from the outside of this case, as is evident from Fig. l of thedrawin gs. or draw it to, the side of the shuttle-case, as

The screw will force the spring tromy occasion may require, accordinglyas it is turned. The tension-spring has three threadholes, H k. throughit; and atthe middle hole a depression or channel, m, is made in thespring extending from said hole to the upper edge of the spring. Thischannel permits coarse thread to be used without forcing the spring outso far as to interfere with the revolution of the bobbin. A thread-hole,l, is formed in the side of the shuttle, through which the thread, if itbe fine, is carried to the sewingmachine after being manipulated asfollows, viz: Carried between the spring and bobbincase through the holek, thence through the hole j, thence through the hole i, and thencethrough the hole I to the sewing-machine. By turning out the screw thetension upon the thread is increased, and turning it in it is decreased.

The channel m might be formed in the side of the shuttlecase, but it isbest in the spring, as it is more readily formed by swaging, and costsless.

We are aware of the patents of Knox, No. 148,072, dated March 3, 1874,and of Hackensmith, No. 125,956, dated April 23, 1872 and therefore donot claim a bobbin with a hinged spring arranged inside of it, andbearing with tension force against the wall of the shuttle; nor do weclaim a spring of the kind adjusted by a screw; but

What we claim is 1. The shuttle case having its point provided with theextended shallow recess 0 and shoulder d, in combination with thecombined latch tension spring D, provided with the parts f and g, as andfor the purpose described.

2. The tension-spring D, constructed with the part f, adapted to extendacross the bobbin-spindle, and the part g, adapted to be pressed orengaged by a screw, substantially as and for the purpose described.

3. The tension-spring, provided with suitable threading-eyes for finethread, and with the coarse-thread channel m, which extends from thethread-hole j to the edge of the sprin g, substantially as and for thepurpose described JOHN BEAVER. JEDEDIAH M. TALLMAN.

Witnesses:

J. B. PEL'roN, J. J. PELTON.

